3407991

Information

• Patent Grant
• 3407991

• References
• Source

• Patent Number

  3,407,991

• Date Filed

  Not available

• Date Issued

  Tuesday, October 29, 1968
  56 years ago

• CPC

  • H01J41/18 - with ionisation by means of cold cathodes
  • H01J41/04 - with ionisation by means of thermionic cathodes
  • H01J41/16 - using gettering substances
  • H01J41/20 - using gettering substances

• US Classifications

  • 417 - Pumps